The B1101 is the control board of the Berson EcTronic Omega system, the later generation of the EcTronic platform. It carries the lamp supervision, wiper drive and alarm handling for the reactor. Omega boards are not interchangeable with the earlier EcTronic B9503 or EcTronic+ B0401 boards; the three generations share an architecture but not a part number. Read the designation printed on the existing board before ordering, and quote the panel serial number if the plant has been retrofitted.